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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892b7103e9152284e95246ccb3d6439043b0e750c8ad6c951764b8d68cda5054' 
  AND token = '5yzH1oEXt050ud3tVNwSaaPUvYRUDT3Ajgpz5mD1xek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}